I'd like to know if is any source of information regarding the phisical properties (e.g. Modulus of Elasticity and exp. coefficient) of EN steels (e.g. 1.4301) at negative temperatures.
EN 13480 have the lower limit at plus 20 deg. with the note that "Values of 20 °C may also be used for temperatures between 0 °C and 20 °C" while Caesar database at minus 40 (how come?).

I'm interested to know values for temperatures lower than minus 40.

Thank you,